Figure 1From: Spatio-temporal patterns of bladder cancer incidence in Utah (1973-2004) and their association with the presence of toxic release inventory sitesPopulation per square kilometer by census tract. Figure 1 displays the population density in the 496 census tracts in Utah, based on 2000 U.S census. Utah's population was mainly concentrated in the counties of Weber, Davis, Salt Lake and Utah.Back to article page